Introduction In order to adapt to the periodic output characteristics of CFETR fusion reactors, the fusion power plant adopts a helium-molten salt energy storage-water (steam) power cycle three-circuit system. The parameters and thermal scheme of the three-circuit steam cycle have a significant impact on the investment and power generation benefit of the power generation island. High parameters and complex thermal schemes can improve cycle efficiency but increase initial investment; low parameters and simple thermal schemes have lower cycle efficiency but significantly reduce initial investment. Therefore, the selection of steam parameters and thermal schemes for the three-circuit system should comprehensively consider power generation efficiency and initial investment and should be selected based on the principle of optimal comprehensive economy.
Method Based on the simulation software Ebsilon, modeling and simulation were carried out in this study to examine the performance of the thermal cycle under different regeneration schemes and different main steam and reheat parameters. By calculating different thermal schemes and parameter combinations, the total efficiency and output power under each operating condition were obtained, and the investment in the main equipment of the three-circuit system and its variation with parameters were analyzed.
Result Taking into account the total investment and returns of the energy storage island and the conventional island, it is recommended to adopt a thermal scheme with 9-stage regeneration, and main steam parameters of 12.4 MPa, and 540 ℃.
Conclusion The three-circuit steam parameters and thermal scheme proposed in the study have reference value for subsequent research on fusion power generation technology and engineering design.
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